Speedometer-controlled iginition-circuit breaker.



J. W. JOHNSON. SPE-EDOMETER CONTROLLED IGNITION CIRCUIT BREAKER.

APPLICATION FILED APR.8. I9I6.

1,223, 177. Patented Apr 17,1911

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which the pointer 11 of a speedometer des- JOEL W. JOHNSON, OI PINE BLUFF, ARKANSAS.

SPEEDOMETER-CONTROLLED IGNITION-CIRCUIT BREAKER.

Specification of Letters Patent.

Patented Apr. 1'7, 1917.

Application filed April 8, 1916. Serial R 0. 89,875.

To all whom, it may concern:

Be it known that I, JOEL W. JOHNSON, a citizen of the United States, residing at, PineBlufi, in the county of Jefferson and State of Arkansas, have invented new and useful Improvements in Speedometer-Controlled Ignition-Circuit Breakers, of which the following is a specification.

This invention relates to speedometercontrolled ignition circuit breakers, the broad object of the invention being to produce means whereby when a speedometer such as is now commonly used in automobiles, indicates a certain predetermined mileage per hour, the ignition circuit will be automatically broken thereby throwing the internal combustion engine out of oration until the speed of the machine falls below the predetermined speed whereupon the ignition circuit will again be automati cally closed, enabling the operator to procee 1 With the above and other objects in View, the invention consists in the novel construction, combination and arrangement of parts, as herein described, illustrated and claimed.

In the accompanying drawings Fi re 1 is a longitudinal section through the circuit breaker of this invention.

Fig. 2 is a view illustrating the face of a speedometer, also showing the circuit breaker, and the wiring plan.

The circuit breaker contemplated in this invention, in the preferred embodiment thereof, comprises the shell or tubular body 1 of brass or like material, the same being lon 'tudinally bored throughout nearly the entire length. thereof to receive a reciprocatory core 2. The bore indicated at 3 is thus left open at one end to admit of the insertion and removal of the core 2 while the opposite end thereof is closed with the exception of a small central opening a through which is inserted a contact post 5. At its inner end the post 5 is provided with a head 6 against which bears one end of a coiled expansion spring 7 the opposite extremity of which bears against the inner end of the slidable core 2.

Encircling the shell 1 is a solenoid coil 8 having one terminal thereof connected to a battery shown at 9 and the other terminal electrically connected to a contact 10 with isgnated generally at.A is adapted to come in contact at a certain predetermined point.

It will, of course, be understood that .the 7 contact 10 may be located at any point'in order that 1 the ignition circuit may be broken at any predetermined 'milea e per hour. The shell'l also comprises a etachable section 12 which'is internally threaded and screwed upon the open end of the main body 1 of the shell as indicated at 13. The opposite end of the shell section .12 is closed withthe exception of a small central hole 1 through which extends another contact post 14 corresponding with the post 5 but located at the opposite end of the circuit breaker. The post 14 is insulated from the member 12 by means of insulating washers 16 and 17 and an insulating sleeve or bushing 18. The

circuit breaker is incorporated in the ignition circuit of which the contact posts 5 and 14 form parts when the sections of the circuit wires are connected thereto in any 'manner. The hand or pointer 11 is shown as sweeping over the face of a graduated dial A and this dial is illustrated as formed with a concentric slot 10 along which the contact piece 10 is shiftable so that it may be This makes the device adjustable to different speeds at which the ignition circuit will be broken.

From. the foregoing description, taken in connection with the accompanying drawings, it will now be understood that up to the time the pointer 11 of the speedometer registers the predetermined mileage, the circuit through the .circuit breaker remains unbroken. As soon, however, as the indicator or pointer 11 touches the contact 10, a current passes through the solenoid coil 8 and thereby retracts the core 2 against the tension of the spring 7. This breaks the contact in the ignition circuit and therefore no ignition takes place in the cylinder or cylinders of the engine until the speed is reduced below the predetermined mileage point, whereupon the current through t e solenoid coil 8 is cut out and the ignition circuit is again closed by the operation of placed opposite any desired graduati0n.

connection With the induction coil in the contact of the speedometer, a slidable core mounted Within. said shell, a spring arranged Within said shell and serving to yieldingly hold the core in contact With one of said contact posts said spring at its opposite end bearing against the head of the other contact post, and an electric circuit in Which said solenoid coil is incorporated controlled by said movable indicator in conjunction With said contact.

In testimony whereot I aflix my signature in presence of two Witnesses.

JUEL 'W. JHNSN Witnesses:

H. B. STRANGE? J. B, (l JOHNSON. 

